Wedge clamps for dies with tapered clamping edge Wedge clamps ...

Safety levels for the installation
of wedge clamps
Safety requirements are defined by safety regulations
and manufacturing technology.
In accordance with up to date practice hydraulic die
clamping systems are divided into 3 safety levels.
1 st safety level:
Preferably used in connection with post-guided dies.
Pressure switches in each clamping circuit for
clamping force control as machine safety.
Two hydraulic circuits independent of each other.
Pressure switch
Clamping element
Clamping circuit 1 = 50% of the clamping
elements in the bed and the
slide, respectively
Clamping circuit 2 = 50% of the clamping
elements in the bed and the
slide, respectively
Clamping circuit 1
Clamping circuit 2
Unclamping circuit
If one circuit fails, the upper or lower die is still
clamped with 50% of the total clamping force. Thus,
the 2 nd clamping circuit becomes a safety circuit.
2 nd safety level:
Used in connection with dies that are not post-guided.
A check valve (pilot-controlled) keeps pressure in
the clamping and safety circuit when pressure drops
in the remaining system.
Clamping circuit 1
Clamping circuit 2
Unclamping circuit
Check valve
(pilot-controlled)
3 rd safety level:
Used in connection with dies on power presses and
car body presses that are not post-guided.
Clamping circuit
Unclamping circuit
Pressure switch
Check valve
(pilot-controlled)
All clamping elements are secured by pilot-controlled
check valves. In the event of pressure drop > 20%
of the operating pressure, the press is switched off
by a pressure switch. The check valves ensure that
the clamping force is maintained over many days.
For this safety level, wedge clamps with locking
bolts and valve sequence controls are used.
Maximum safety by standard wedge clamps.
Subject to technical modification
Hilma-Römheld GmbH
2.2460 Schützenstraße 74 · D-57271 Hilchenbach
4
03/2006
Phone +49 (0) 2733 / 281-0 · Fax +49 (0) 2733 / 281-113 · www.hilma.de